seg fault - link list within a link list

[ezeke1]

The idea is to have a singly link list of nodes and each node has a local table of data represented by another link list. I know where the seg fault is coming from, but I don't know why. Rather than paste my whole program, I typed up this stub that shows what Im trying to do. If there are typos, please ignore as the program compiles. Can anyone shed some insight into what I may be doing wrong?

typedef struct table {
   char *name;
   struct table *next;
} table_rec, *table_ptr;

typedef struct list {
   char *listname;
   struct list *next;
   table_ptr   table;
} list_rec, *list_ptr;

list_ptr new_list(char *name);
table_ptr new_table(char *name);
list_ptr LIST;

void main() {
   list_ptr a = new_list("first");
   a->next = LIST;
   LIST = a;    //list is a->null

   list_ptr b = new_list("second");
   b->next = LIST;
   LIST = b;    //list is b->a

   //now create local data for second node
   table_ptr ta = new_table("foo"); //this is fine
   ta->next = LIST->table; //this causes seg fault
   LIST->table = ta; //this causes seg fault
}

list_ptr new_list(char *name) {
    //create node
    list_ptr temp = (list_ptr)malloc(sizeof(list_rec));
    temp->name = (char*)strdup(name);
    temp->next = NULL;
    temp->table = NULL;
    return temp;
}

table_ptr new_table(char *name) {
    //create node
    table_ptr temp = (table_ptr)malloc(sizeof(table_rec));
    temp->name = (char*)strdup(name);
    temp->next = NULL;
    return temp;
}

 

[ezeke1]

I tested the code some more and the problem appears to be caused by something else, please disregard this post.

 

[TrojanWarBlade]

You should never ignore typos or any other kind of errors.
You only need one of those typos to actually cause a problem and you are ignoring a ticking timebomb.
I tried to compile your code and got a bunch of errors.
I was gonna fix them all and check the code out but since you say the problem is elsewhere I wont bother.



Trojan.